Well, what I would do is make a contract up and a handbook of policies and issue them to all your clients. Have a sheet where they put down the days and hours they need, and have them stick to those days. If they don't want to sign a contract, then start looking for clients to replace them. You need to have your days organized or you are going to burn out from the stress. Get the parents to commit to the same 3 days a week if you can, and go from there. Also, do not allow them to run the show. Have a policy about needing 24 hour notice of any changes to care, as you need to be able to plan your meals/days etc.